<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

<el-button type="text" @click="openChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}

                <span class="acts">
                    <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}

                <span class="acts">
                    
                    <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                    <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
<el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
  <el-form :model="video" label-width="120px">
    <el-form-item label="课时标题">
      <el-input v-model="video.title"/>
    </el-form-item>
    <el-form-item label="课时排序">
      <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
    </el-form-item>
    <el-form-item label="是否免费">
      <el-radio-group v-model="video.isFree">
        <el-radio :label="true">免费</el-radio>
        <el-radio :label="false">默认</el-radio>
      </el-radio-group>
    </el-form-item>
    <el-form-item label="上传视频">
        <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadAliVideo'"
            :limit="1"
            class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
    </el-form-item>
  </el-form>
  <div slot="footer" class="dialog-footer">
    <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
    <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
  </div>
</el-dialog>

  </div>
</template>
<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
    data() {
        return {
            saveBtnDisabled: false,
            courseId: '',  // 课程id
            chapterVideoList:[],
            chapter: {  // 封装章节数据
                title: '',
                sort: 0
            },
            video: {
                title: '',
                sort: 0,
                isFree: 0,
                videoSourceId: '',
                videoOriginalName: ''
            },
            dialogChapterFormVisible: false,  // 章节弹框
            dialogVideoFormVisible: false,    // 小节弹框
            saveVideoBtnDisabled: false,

            fileList: [],  // 上传文件列表
            BASE_API: process.env.BASE_API  // 接口API地址
            
        }
    },
    created() {
        // 获取路由的id值
        if(this.$route.params && this.$route.params.id) {
            this.courseId = this.$route.params.id
            // 根据课程id查询章节和小节
            this.getChapterVideo()
        }
    },
    methods:{
        // 点击确定调用的方法
        handleVodRemove() {
            // 调用接口的删除视频的方法
            video.deleteAliyunvod(this.video.videoSourceId)
                .then(response => {
                    // 提示信息
                    this.$message({
                        type: 'success',
                        message: '删除视频成功!'
                    });
                    // 把文件列表清空
                    this.fileList = []
                    // 把video视频id和视频名称值清空
                    // 上传视频id赋值
                    this.video.videoSourceId = ''
                    // 上传视频名称赋值
                    this.video.videoOriginalName = ''
                })
        },
        // 点击x调用这个方法
        beforeVodRemove(file, fileList) {
            return this.$confirm(`确定移除 ${file.name}?`)
        },
        // 上传视频成功调用的方法
        handleVodUploadSuccess(response, file, fileList) {
            // 上传视频id赋值
            this.video.videoSourceId = response.data.videoId
            // 上传视频名称赋值
            this.video.videoOriginalName = file.name
        },
        handleUploadExceed() {
            this.$message.warning('想要重新上传视频，请先删除已上传的视频')
        },
//==============================小节操作====================================
        // 删除小节
        removeVideo(id) {
            this.$confirm('此操作将删除小节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  // 点击确定，执行then方法
                // 调用删除的方法
                video.deleteVideo(id)
                    .then(response =>{  // 删除成功
                    // 提示信息
                    this.$message({
                        type: 'success',
                        message: '删除小节成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
            }) // 点击取消，执行catch方法
        },
        // 修改小节弹框数据回显
        openEditVideo(videoId) {
            // 弹框
            this.dialogVideoFormVisible = true
            // 调用接口
            video.getVideo(videoId)   
                .then(response => {
                    this.video = response.data.video
                    // 以下这段代码回显上传好的视频
                    if (this.video.videoSourceId !== '') {
                        this.fileList = [{name: this.video.videoOriginalName, url: this.video.videoSourceId}]
                    } else {
                        this.fileList = []
                    }
                })
        },
        // 添加小节弹框的方法
        openVideo(chapterId) {

            // 清空信息
            this.video.id = ""
            this.video.title = ""
            this.video.sort = 0
            this.video.isFree = 0
            this.videoSourceId = ""
            this.fileList = []
            
            // 弹框
            this.dialogVideoFormVisible = true
            // 设置章节id
            this.video.chapterId = chapterId
        },
        // 添加小节
        addVideo() {
            // 设置课程id
            this.video.courseId = this.courseId
            video.addVideo(this.video)
                .then(response => {
                    // 关闭弹框
                    this.dialogVideoFormVisible = false
                    // 提示
                    this.$message({
                        type: 'success',
                        message: '添加小节成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
        },
        // 修改章节的方法
        updateVideo() {
            video.updateVideo(this.video)
                .then(response =>  {
                    // 关闭弹框
                    this.dialogVideoFormVisible = false
                    this.video.id = ""  // 修改成功后要清空id, 否则下一次新增会当成编辑
                    // 提示
                    this.$message({
                        type: 'success',
                        message: '修改小节成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdateVideo() {
            if(!this.video.id) {
                this.addVideo()
            } else {
                this.updateVideo()
            }
        },

//==============================章节操作====================================
        // 删除章节
        removeChapter(chapterId) {
            this.$confirm('此操作将删除章节, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  // 点击确定，执行then方法
                // 调用删除的方法
                chapter.deleteChapter(chapterId)
                    .then(response =>{  // 删除成功
                    // 提示信息
                    this.$message({
                        type: 'success',
                        message: '删除成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
            })  // 点击取消，执行catch方法
        },
        // 修改章节弹框数据回显
        openEditChatper(chapterId) {
            // 弹框
            this.dialogChapterFormVisible = true
            // 调用接口
            chapter.getChapter(chapterId)   
                .then(response => {
                    this.chapter = response.data.chapter
                })
        },
        // 弹出添加章节页面
        openChapterDialog() {
            // 弹框
            this.dialogChapterFormVisible = true
            // 表单数据清空
            this.chapter.title = ''
            this.chapter.sort = 0
        },
        // 添加章节
        addChapter() {
            // 设置课程id到chapter对象里面
            this.chapter.courseId = this.courseId
            chapter.addChapter(this.chapter)
                .then(response => {
                    // 关闭弹框
                    this.dialogChapterFormVisible = false
                    // 提示
                    this.$message({
                        type: 'success',
                        message: '添加章节成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
        },
        // 修改章节的方法
        updateChapter() {
            chapter.updateChapter(this.chapter)
                .then(response =>  {
                    // 关闭弹框
                    this.dialogChapterFormVisible = false
                    this.chapter.id = ""  // 修改成功后要清空id, 否则下一次新增会当成编辑
                    // 提示
                    this.$message({
                        type: 'success',
                        message: '修改章节成功!'
                    });
                    // 刷新页面
                    this.getChapterVideo()
                })
        },
        saveOrUpdate() {
            if(!this.chapter.id) {
                this.addChapter()
            } else {
                this.updateChapter()
            }
        },
        // 根据课程id查询章节和小节
        getChapterVideo() {
            chapter.getAllChapterVideo(this.courseId)
                .then(response => {
                    this.chapterVideoList = response.data.allChapterVideo
                })
        },
        previous() {
            this.$router.push({path:'/course/info/'+this.courseId})
        },
        next() {
            // 跳转到第二步
            this.$router.push({path:'/course/publish/'+this.courseId})
        }
    }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>